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鄂尔多斯盆地南部高桥地区上古生界储层主要为下石盒子组和山西组砂岩,本次研究目的层段为盒8段。研究表明盒8段主要发育辫状河三角洲沉积体系,前缘水下分流河道微相发育,河道横向反复迁移,纵向多期叠置,砂体呈大面积毯式分布。盒8段岩性受物源区控制,石英砂岩大面积分布,孔隙类型主要以溶蚀孔为主,储层孔隙度在2.0%～10.0%之间,平均8.3%;渗透率在0.1～1.0 mD之间,平均0.748 mD,储层物性表现为“低孔低渗”特征,具有形成大型气田的储层条件。该段储层分布主要受控于主河道砂体展布,溶蚀作用对储层储集性能的提高具有重要意义。
The Upper Paleozoic reservoirs in the Takahashi area in the southern Ordos Basin are mainly Lower Shihezi Formation and Shanxi Formation sandstones. The results show that the development of the braided river delta system mainly develops in the 8th block, the microfacies of the submarine distributary channel in the leading edge develop, the river channels repeatedly migrate in the horizontal direction, and the sedimentary systems in the 8th stage are superimposed longitudinally. The lithology of box 8 is controlled by the provenance area. Quartz sandstones are widely distributed. The pore types are dominated by dissolved pores. The porosity of reservoirs ranges from 2.0% to 10.0% with an average of 8.3%. Permeability ranges from 0.1 to 1.0 mD With an average of 0.748 mD. The reservoir properties are characterized by “low porosity and low permeability” and have the reservoir conditions for forming large gas fields. The reservoir distribution is mainly controlled by the distribution of sand bodies in the main channel, and dissolution plays an important role in the improvement of reservoir performance.